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03047009b1
This patch is a prerequisite for compiling the code with the warnings -Wconversion enabled. Issue #23
76 lines
1.6 KiB
C++
76 lines
1.6 KiB
C++
/*
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* \brief Time source that uses the General Purpose Timer (Freescale)
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* \author Stefan Kalkowski
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* \date 2019-04-13
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*/
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/*
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* Copyright (C) 2019 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* local includes */
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#include <time_source.h>
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using namespace Genode;
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void Timer::Time_source::set_timeout(Genode::Microseconds duration,
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Timeout_handler &handler)
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{
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_handler = &handler;
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/* set to minimum ticks value to not miss a too short timeout */
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uint32_t const ticks =
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max((uint32_t)1, (uint32_t)((duration.value * TICKS_PER_MS) / 1000));
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/* clear interrupts */
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if (read<Sr>()) {
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write<Sr>(0xffffffff);
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_timer_irq.ack_irq();
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}
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/* set new timeout */
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write<Ocr1>(read<Cnt>() + ticks);
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}
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Duration Timer::Time_source::curr_time()
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{
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Cnt::access_t cur_cnt = read<Cnt>();
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Genode::Microseconds us(timer_ticks_to_us(cur_cnt - _last_cnt, TICKS_PER_MS));
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_last_cnt = cur_cnt;
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_curr_time.add(us);
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return _curr_time;
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}
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Microseconds Timer::Time_source::max_timeout() const
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{
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static unsigned long max = timer_ticks_to_us(0xffffffff, TICKS_PER_MS);
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return Genode::Microseconds(max);
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}
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void Timer::Time_source::_initialize()
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{
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_timer_irq.sigh(_signal_handler);
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write<Cr>(0);
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write<Ir>(0);
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write<Ocr1>(0);
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write<Ocr2>(0);
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write<Ocr3>(0);
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write<Icr1>(0);
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write<Icr2>(0);
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write<Cr::Clk_src>(Cr::Clk_src::HIGH_FREQ_REF_CLK);
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while (read<Cr::Swr>()) ;
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write<Sr>(0);
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write<Cr::Frr>(1);
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write<Cr::En_mod>(1);
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write<Cr::En>(1);
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write<Ir>(1);
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}
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